.footer{
  width: 100%;
  height: 80px;
  background-color: black;
}
.foot_smallbox{
  width:100%;
  margin:0 auto;
  overflow:hidden;
  text-align: center;
}
.foot_li{
  float: left;
  display: inline-block;
  width: 33.333%;
  line-height: 80px;
  font-size: 1.3vw;
  color: white;
}
.foot_li:hover{
  background: #0D0D0D;
  font-size: 1.8vw;
  transition: 0.5s;
}
